This indicates an attack attempt to exploit a Privilege Escalation Vulnerability in HP Release Control.
The vulnerability is due to a design flaw while parsing a crafted HTTP request. A remote attacker could exploit this to gain admin privileges of the target application, via a crafted HTTP request.
HP Release Control 9.20.0000, Build 395
Privilege Escalation: Remote attackers can leverage their privilege on the vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue